| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: SR standby hangs |
| Date: | 2011-02-18 19:23:00 |
| Message-ID: | 13130.1298056980@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> The symptom is that the recovery process blocks forever on a semaphore.
> We've crashed it and got the following backtrace:
> #0 0x0000003493ed5337 in semop () from /lib64/libc.so.6
> #1 0x00000000005bd103 in PGSemaphoreLock (sema=0x2b14986aec38, interruptOK=1
> '\001') at pg_sema.c:420
> #2 0x00000000005de645 in LockBufferForCleanup () at bufmgr.c:2432
> #3 0x0000000000463733 in heap_xlog_clean (lsn=<value optimized out>,
> record=0x1787e1c0) at heapam.c:4168
> #4 heap2_redo (lsn=<value optimized out>, record=0x1787e1c0) at heapam.c:4858
> #5 0x0000000000488780 in StartupXLOG () at xlog.c:6250
So who's holding the buffer lock that it wants? Are you sure this is an
actual hang, and not just recovery waiting for a standby query to complete?
regards, tom lane
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